There is "limited" hope over rescuing a 10-year-old Vietnamese boy who has been trapped in a concrete pillar for three days, rescuers say.

Thai Ly Hao Nam fell into the 25cm (12-inch) wide shaft of the pillar while looking for scrap metal in southern Vietnam on New Year's Eve.

Soldiers and engineering experts have been removing mud and water in an attempt to bring the pillar up.

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